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Paddle-wheel type flow meter

  • US 4,936,151 A
  • Filed: 06/05/1989
  • Issued: 06/26/1990
  • Est. Priority Date: 06/03/1988
  • Status: Expired due to Fees
First Claim
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1. A paddle-wheel type flow meter comprising:

  • (a) a boss portion formed in a side area of a fluid-transport pipe, said boss portion being provided with a bore which communicates with the interior of said fluid-transport pipe;

    (b) a plug element which is made of transparent materials while detachably inserted in said bore of said boss portion of said fluid-transport pipe;

    (c) a paddle wheel is rotatably mounted on a pair of horizontal bearing portions while rotatably driven by a fluid passing through said fluid-transport pipe, said horizontal bearing portions being provided in an inner end area of said plug element, said inner end area of said plug element being exposed to said fluid passing through said fluid-transport pipe;

    (d) a pair of insertion holes so provided in an upper surface of said plug element as to substantially vertically extending downward side by side from said upper surface to reach their bottom surfaces which are in the substantially same levels as those of bearings portions of said plug element;

    (e) a pair of optical-fiber cables, each of which cables is provided with a pair of terminals, one of which cables forms a light-emitting cable while the other of which cables forms a light-receiving cable, one of said terminals of said light-emitting cable being connected to a light source while the other one of said terminals serves as a light-output terminal inserted into one of said insertion holes of said plug element, one of said terminals of said light-receiving cable being connected to an optical receiver forming a photoelectric converter while the other of said terminals of said light-receiving cable serves as a light input terminal inserted into the other of said insertion holes of said insertion holes of said plug element; and

    (f) a pair of optical reflectors, one of which serves as a light-emitting reflector and the other of which optical reflectors serves as a light receiving reflector, said light-emitting reflector being so disposed in a bottom portion of one of said insertion holes of said plug element as to receive a light emitted from said light-emitting cable, said light having been received by said light-emitting reflector being oriented toward a paddle-wheel housing so as to pass across said paddle-wheel housing, said light-receiving reflector being so disposed in a bottom portion of the other one of said insertion holes of said plug element as to receive said light emitted from said light-emitting reflector, said light having been received by said light-receiving reflector being oriented toward said light-receiving cable.

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